研究人員達成量子態隱形傳送 超過 10哩的無物空間

研究人員達成量子態隱形傳送 超過 10哩的無物空間
Researchers Achieve Quantum Teleportation Over 10 Miles of Empty Space
By Rebecca Boyle
Posted 05.19.2010 at 12:59 pm

Beam Us Up Teleportation doesn't work for humans — yet — but it works over long distances, a new study reports. Time Magazine
光束照射我們的隱形傳輸並不適合人類 - 仍然- 但它在長距離掂咗，一項新研究報告，時代雜誌

Scientists in China have broken the record for quantum teleportation, achieving a distance of about 10 miles, according to a new study in Nature Photonics. That's a giant leap from previous achievements.
在中國的科學家們已打破量子隱形傳輸紀錄，達到約 10哩的距離，根據在自然光子學的一項新研究，那是從舊成就的一項巨大躍進。
The feat brings us closer to communicating information without needing a traditional signal transmission, the researchers note.
這一壯舉帶給我們更接近，去溝通信息而無需傳統的信號傳輸，研究人員加以註釋。
Although it's called teleportation, no matter is really moved. Rather, the quantum state of one object is transferred to another object.
雖然它被稱為隱形傳輸，不是真的被移動，相反，是一件物體的量子態被轉移到另一件物體。

It works by entangling two objects, like photons or ions. The first teleportation experiments involved beams of light. Once the objects are entangled, they're connected by an invisible wave, like a thread or umbilical cord. That means when something is done to one object, it immediately happens to the other object, too. Einstein called this "spooky action at a distance."

Until now, this has only been achieved with particles that are at most a couple hundred feet apart. And those distances have been accomplished with fiber channels, which help preserve the photons' state.

In the latest experiment, researchers entangled two photons and zapped the higher-energy one through a special 10-mile-long free-space tunnel, instead of a fiber one. The distant photon was still able to respond to the changes in state of the photon left behind, an unprecedented achievement.

It worked because the team "maximally entangled" the photons, using spatial and polarization modes, according to Ars Technica. About 89 percent of the information was maintained, also an improvement over previous experiments.

The work was done at the Hefei National Laboratory for Physical Sciences at Microscale and the Department of Modern Physics, University of Science and Technology of China, Hefei.

Though a 10-mile teleportation is impressive, there's still a long way to go before information can safely be sent this way. Photons are good at transmitting information, but ions are better at allowing manipulation, which would be necessary for encryption, Ars Technica notes.

http://www.popsci.com/science/article/2010-05/researchers-achieve-quantum-teleportation-over-10-miles

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